What happens when ferrimagnetic ${{Fe}_{3}}$${{O}_{4}}$ is heated at 850 K and why?

CBSE Class 12 CBSE Class 12 Chemistry
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1

when ferrimagnecic ${{Fe}{3}}$${{O}{4}}$ is heated at 850 K, it
loses lernmagnetism and becomes paramagnetic due to
randomisation of spins.